Ymddiried, v. to confide
Ymddiserchu, v. to divest one’s self of affection
Ymddwyn, n. deportment; gestation, bearing: v. to comport; to bear
Ymddychrynu, v. to frighten one’s self
Ymddychwelyd, v. to turn one’s self back
Ymddyeithro, v. to estrange one’s self
Ymddyfalu, v. to imagine in one’s self
Ymddygiad, n. behaviour
Ymddyrwyn, n. self-winding
Ymddyrysu, v. to self-entangle